56 N.S. ENTOMOLOGICAL SOCIETY. 



er whitish stripe bearing a second row of tubercles similar to those on the previous 

 stripes but of a brownish color. Then conies another grayish stripe on either side 

 reaching to the junction of the legs and pro legs with the body, also bearing tubercles 

 as the previous ones but smaller. The tufts or brushes on the dorsum of the first and 

 second abdominal segments are whitish gray while those on the third and fourth are 

 yellow; all four tufts are lmm.-1.5mm. in length. On each side of the second abdom- 

 inal segment there is a lateral pencil of black hairs feathered at the tip, standing out at 

 right angles to the body 1.5mm.-2mm. long. The orange tubercles on the sixth and sev- 

 enth segments dorsally have not increased in size to any extent. The pencil on the 

 eighth segment is more compact than those on the first thoracic and second abdominal 

 segments. The hairs are feathered near the tip; 2mm.-2.2mm. long. The ninth seg- 

 ment is unchanged other than in increased size. The legs and pro legs are light gray 

 in color. All tubercles bear tufts of hair except the circular ones on the dorsum of sixth 

 and seventh abdominal segments. General color from purplish gray to a slate gray. 

 Duration of fourth instar five to seven days. 



Fifth Instar. — In this instar, the difference in sex is readily distinguishable. 

 The male larvae measure 16mm.-18mm in length, the female larvae 20mm.-25mm and 

 are much stouter. The heads are black and measure 2.24 mm.-2.64mm. in width. 

 Prothoracic shield orange color. The two tufts of yellowish hair between the pencils 

 on the first thoracic segment are much longer and extend well down over the head. 

 The two pencils of black hairs now measure 4 mm. -5mm. They are not quite so com- 

 pact as in the previous instar but very feathery. The second and third thoracic seg- 

 ments have four small tubercles on the dorsum intersected by a narrow black stripe 

 which widens as it runs dorsally over the first four abdominal segments, narrowing 

 down again over the following four. On each side of the first abdominal segment there 

 is a small pencil of creamy white hairs 2 mm. -3mm. long. They are less feathery than 

 those on the sides of second abdominal segment, which are also 2mm.-3mm. in length. 

 The tufts or branches on the dorsum of the first four abdominal segments are all creamy 

 white in color and terminate in a wedge shaped point. They are 2mm. -2. 5 mm in 

 length and in all appearances resemble a painter's brush. The fifth, sixth and seventh 

 abdominal segments have on the lateral margin of the longitudinal black stripe a red 

 spot bearing a few scattering hairs. On the outside of each spot is an additional red 

 tubercle bearing yellowish hairs. The dorsal circular orange colored tubercles in the cen- 

 tre of the sixth and seventh abdominal segments are apparently unchanged in size but 

 of a brighter color. The black pencil on the dorsum of the eighth segment is not so com- 

 pact as in the previous instars, is quite feathery, and measures 3.5mm-4mm. in length. 

 On each side of the black stripe that runs dorsally over this segment there is a short 

 white stripe. The ninth abdominal segment is of a purplish gray color with three small 

 dorsal tubercles bearing yellowish and black hairs. The first row of tubercles on either 

 side of the longitudinal black dorsal stripe are of a bright orange color but the second 

 and third rows are paler in color. Between the second and third rows of lateral tubercles 

 on either side running longitudinally is a narrow broken black line with light blotches 

 below it. The general. color is still purplis'h gray to slate gray but rather brighter in the 

 case of the male. Duration of fifth instar seven to fourteen days. 



Sixth Instar. — As previously mentioned the female larvae frequently moult a 

 fifth time, this taking place from seven to thirteen days after the fourth. The head 

 measures 3mm.-3.5mm. in width, otherwise there is very little difference in appearance or 

 size from those that have only moulted four times when the two are ready to spin their 

 cocoons. During the last few days of the larval period, all the larvae fed ravenously 

 and grew rapidly. 



